Explosive lock



C. A. HARBAUGH.

EXPLOSIVE LOCK.

APPLICATION FILED MAY 25, 1920.

1,390,704, PatentedSept. 13,1921.

' UNITED STA'llES PATENT OFFICE.

(mums annexation, F LINWOOD, KANSAS.

Exnosxvn LOCK.

Application filed May 25, 1920. Serial No. 384,175.

To all 1.0710111 it m (19 concern Be it known that I CHARLES A. linemenu, a citizen of the United States, residing at Linwood, in thecounty. of Leavenworth, State otKansas,have invented a new and useful:liXPlOSlVGLOCk; and I do hereby declare the iollowing to be a lull,clear. and exact dcscrhgtion of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The invention relates to locks, sates, vaults and the like and has forits object to provide an explosive device which will explode when thelocks are tampered with by unauthorized persons, the explosive chargebeing sufficient to act as an alarm and at the same time may be soregulated as to so injure the intruder so that he can be easilyapprebended.

A further object is to provide a lock having in connection therewith ahand grenade preferably of the Mills type and so connected to the lockthat when the lock is forced open by anunauthorized person the firingpin ot the grenade will be released and the grenade allowed to explode.Also to provide means whereby the firing pin may be held againstmovement when the lock is being opened by an ZlllllllOl'iZCtl person.

With the above and other objects in view the invention resides in thecombination and arrangement of parts as hereinafterset shown in thedrawings, described and claimed, it being understood that changes in theprecise embodiment of the invention may be made within the scope of whatis claimed without departing from the spirit of the invention.

In the drawings Figure l is a sectional view through a conventional formof lock showing the invention applied thereto.

Fig. 2 is an enlarged sectional view showing the lock shackle arm whichengages and holds the grenade firing pin.

Fig. 3 is a perspective view of a portion of the grenade showing thefiring pin.

Fig. l is a detail sectional view taken on line il-4 of Fig. 1 lookingin the direction of the arrows.

Fig. 5 is a side elevation oi? the lock bodv showing key aperture, whichmay be concealed and in which aperture a key may be placed for holdlngthe firing pin against movement when authorized persons are operatingthe look. A

swi of Letters ent. Patented Sept. 12:,

Referring to the drawings, the numeral 1 designates the lock body and 2the shackle thereof. Shackle 2 has its arm 3 rotatably mounted inbearings at oi the lock body so that when the detents 5 which engage thearm 3 arethrown out of engagement with the arm 2;), the shackle may bepivoted around on said arm. The lower detent 6 has one of its endsdisposed in an aperture 7 in the arm I) and in engagement with anannular groove 8 of the firing pin 9. Detent (3 holding the firing pinagainst the action of the spring 10 until the lock is forced open by anauthorized person or by a skeleton key. The firing pin is normally heldin its outer position and when released fires the grenade 11, thereforeit will be seen that when the detents 5 and 6 are moved out ofengagement with the arm 3, either by rotation oi the key l2 or byforcil'lg the lock that the upper end 13 of the firing pin will bereleased from the recess l'sl. and will move downwardly under theimpulse of the spring 10 and explode the grenade.

The firing pin 9 is slidably mounted in a bushing 15 which is threadedin the bore 16 of the body of the lock, thereby allowing the removal ofthe upper end of the firing pin from engagement with the lower detcnt 6this being accomplished by a downward pull on the grenade and byscrewing outwardly on the bushing 15 until it is out, of the bore 10.then the firing pin can be moved outwardly until it clears the end ofthe detent 6 and then moved downwardly and out of engagement with thelock. However when an authorized person desires to open the lock. saidperson will place a key 17 in a concealed v aperture 18. The inner endoi? the key will engage the notch 19 on the firing pin 9 and hold thefiring pin against downward movement so that the detents 5 and 6, maybemoved out of engagement with the arm. oi the shackle 2 without danger ofreleasing the firing pin and consequentexplosion of the grenade.Concealed pocket 18 may be concealed in any suitable manner however apivoted cover 19 is shown for purposes of illustration.

From the above it will be seen that a look attachment is provided, whichattachment will when it explodes, not only give an alarm, but willinjure the unauthorized intruder so that he may be easily apprehended.It being the object to inflict as small amount of injury as possible tothe intruder and at the same time to so regulate the charge that it willdo a minimum amount of damage to the surrounding property.

The invention having been set forth what I is claimed as new and usefulis The combination with a lock having a lock bolt disposed therein, ofan explosive device therefor, said explosive device comprising acasinghaving a spring actuated firing pin therein, said firingpinextending through the lock casing and having its end axially disposed ina recess in the end of the lock bolt, a recess carried by said firingpin and registering with an aperture in the end of" the lock bolt, saidrecess and aperture being

